Attachment for concrete mixers



Dec 25, 1928. 1,696,751

R. c. BURKET` ATTACHMENT FOR CONCRETE MIXERS Filed Dec. 16, 192'? 3 Sheets-Sheet 1 @ML o o 4 J4 N1 /Z if K P u Lf4 f5 ff L@ L a i .5 /0

6 a o a o 2X0/ Z0 @Wow/wup Dec. 25, 1928. l 1,696,751

A R. c. BURKET ATTACHMENT FOR CONCRETE MIXERS Filed neo. 16, 1927 :s sheets-snapt' 2- Dea 25, 1928. 1,696,751

R. c. BURKET ATTACHMENT Fon CONCRETE mxERs Filed DeC. 16, 1927 :5 sheets-sheet 3 l 33u34 fl,

Patented Dec. 25, 1928.

UNITED STATES PATENT OFFICE.

ATTACHMENT FOR CONCRETE MIXERS.

Application led December 16, 1927.

This invention aims to provide a simple means whereby a measured quantity of liquid of any desired kind, for instance,

calcium chloride solution, may be discharged into a cement mixture, when the skip is raised.

It is within the province of the disclosure to improve generally and to enhance the utility of devices oi that type to which the invention appertains.

lVith the above and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and m the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of theinvention herein disclosed, may be made within the scope of What is claimed, without departing from the spirit of the invention.

In kthe drawings Figure 1 shows in elevation, a cement mixer whereon the device forming the subject mattei` of this application has. been mounted, the skip being lowered;

Fi re 2 is a View similar to Figure 1', the skip aving been raised;

lFigure 3 is an elevation on an enlarged scale, showing the measuring receptacle in the position of Figure 1, parts being in section;

Figure 4 is an elevation showing the measuring receptacle in the position of Figure 2 (approximately), parts being in section;

igure 5 is a longitudinal section of the mixer for the solution; l

Figure 6 is an end elevation of the structure shown in Figure 5; v

Figure 7 is a cross' section on the line 7-7 of Figure 5.

The numeral 1 marks va cement mixer including a container 2 in'which the aggregate is mixed, the container, in the present embodiment 'of the invention, being a rotatable drum. The numeral 3 marks a delivery member lor skip which is pivoted at 4 to the frame work of the mixer 1, so that the 'skip can be swung upwardly or downwardly, the operating means for the Vskip being of'any desired sort. The material to be mixed is placed in the skip whilst the skip is lowered, as shown in Figune 1, and when the skip raised by the means shown at 5, the material in the skip is vdischarged into the 'drum 2, in a way Well understood by those skilled in the art.

Serial No. 240,538.

The numeral 6 marks a measuring receptacle provided at one end with an air outlet, the outlet 7 being prolonged in a. direction approximately at right angles to the receptacle 6. The outlet 7 carries av casing 8 in which is mounted a float-actuated check valve 9. The measuring receptacle 6 is scoured to the sido oi the skip in su-ch a positien that when the skip 3 is lowered, the longitudinal axis ot the receptacle 6 will be disposed in an approximately horizontal position, as indicated in Figure 1 of the drawings.

The numeral 10 designates a supply pipe, which may be flexible, and the numeral 11 marks a discharge pipe which may be rigid. The discharge side of the skip 3 and is connected thereto by clips 12 or otherwise. The end of the discharge pipe 11 is marked by the numeral 14, and is so disposed upon the skip 3 that whenthe skip is raised from the position of Figure 1,'to the position of Figure 2the pipe 11 will discharge into the drum 2 of the cement mixer 1. Y

The numeral 15 marks a valve casing. The pipe 11 is mounted in one end of the casing 15, and the pipe' 10l is connected to one side of the casing- 15. The valve casing 15 has ports 16,17 and 18. The port- 16 communicates with the supply pipe 10. The port 17 communica-tes with the discharge pipe 11.v The port 18 is located at the opposite end of the casing 15 from the port 17 and communicates with the outer member 19 of an outlet and inlet tube, the member 19 of the tube being mounted inone end ot' the casing 15. VThe inner member of the outlet and iniet tube is designated by the numeral 20' and is connected by means of a coupling 21, to the outer member 19 of the tube. The inner member 20 of the tube is threaded for adjustment into a reinforcing foot plate 22, secured to the end ofthe measuring receptacle 6. The inner member 20 projects into the measuring receptacle 6, as shown in Figure 1.

A valve 23 is mounted to rock in 'the valve casing 15. An arm 24 is secured to the outer end of thevalve 23 and carries a weight '25. The valve 23 is supplied with ports 26, 27 and 28.

A tank 50 is mounted as indicated at 51 on the frame of the cement mixer 1. yIn the tank 5() there is a chambers 53, 'acces `being had to the champipe 11 extends along thev partition 52 form-ing bers 58 by hinged and latched doors 54 on the tank 50. There is a gland in the partition 52. Bearings 56 are mounted in the ends of the tank 50 and carry glands 57. A shaft 58 is journaled inthe glands 55 and 57 and in the bearings 56.' The shaft 58 may be rotated by hand, through the instrumentality ot' a crank 59 on one end ot the shaft, or by means oit a pulley 67 on the other end of the shaft. Agitators 60, in the term of screws, are located in the chambers the tubular hubs for the agitators 6() carrying set screws 61 whereby the agitators are secured to the shaft 58 to rotate with theshaft. Vertical tubes 62, which are transparent, are mounted on the ends oi' the tank 50, and are in communication with the tank. Hydrometers 63 are mounted. to float in the tubes 62. The tank 50 has outlets tetcommunieating with the chambers 58. Valves 65, under the control of an operator, are located in the outlets 64. The outlets 6d are in communication with a pipe 66 which, in its turn, is connected to the supply pipe 10.

When either ot the doors 5/1- is opened, the ingredients may be placed in the chambers 58, the ingredients being mixed by the agitators 60, which are turned by means ot' the shaft 58 and the crank 59, or the pulley 67. The specific gravity of the calcium chloride solution may be determined accurately by means of the hydrometers 68. The advantage in having two chambers 58 is that one batch of calcium chloride solution can be mixed whilst the other batch of calcium chlorideV solution is running out ot the tank 50. The solution leaves the tank 50 by means of either ot the outlets 6K1, depending upon which of the valves 65 is opened, and the solution llows by way of the pipe 66 into the pipe 10.

Vhen the delivery member or slrip 3 is lowered, as in Figure 1 of the drawings, the arm 211, responding to the weight 25, is disposed approximately at right angles to Vthe discharge pipe 11, and the parts then are arranged as shown in VFigure of the drawings. The port 17 of the valve casing 16 is closed, so that liquid cannot flow through the port 26 of the valve 28, 'the port 28 in the valve appearing in communication with the port 16 of the valve casing 15, and the port 27 in the valve 28 being in communication with the port 18 of the valve casing. Calcium chloride solution, or any other substance which it is desired to add to the mixture of concrete, flows from the tank 50, in the way hereinbefore described, through the pipe 10, and flows by way otl the port 16, the port 28, the port 27, the port 18, and the tubes 19 and 20, into the measuring receptacle, until the measuring receptable is iilled, as shown in Figure 3 oit' the drawings. During the filling of the measuring receptacle 6, the air in the measuring receptacle escapes by way ot' the outlet 7 Ultimately, the casing 8 fills with liquid, and the valve 19 rises and closes the outlet tor the casing 18, so that the liquid cannot escape. The valve 9 is shown in the position specified, in Figure 3 of the drawings.

When the skip 3 swung up into the position ot Figure 2, to discharge its contents into the drum 2, the measuring receptacle 6 attains a. substantially vertical position, shownin Figures 4 and 2 ot the drawings, and the liquid in the measuring receptacle 6 is discharged through the pipe 11 into the drum 2tl1rough the end 14 oi' the pipe 11, the end 14e o'l the pipe having been so placed, by the raising of the skip Il, that the liquid will run into the drum 2, troni the end 111- ot the pipe 1l. lVhen the skip 8 is raised, the arm 2l, carrying the weight 25, remains in a substantially vertical position, and relative movement takes place between the valve casing 15 and the valve 28. By the time that the skip 8 has been raised, and when the receptacle 6 is in the position shown in Figure 11, the port 16 in the valve casing 15 is closed, the port 27 in the rotatable valve 23 is closed, the port 28 in the valve registers with the port 18 in the valve casing 15, and the port 26 registers with the port 17 in the valve casing. rlhe liquid can then run out oic the measuring receptacle 6 through the tubes 20 and 19, through the ports 18 and 28, and through the ports 26 and 17, into the pipe 11, :trom which the liquid flows into the drum 2, as hereinbefore described. As the liquid runs out ot the receptacle 6, whilst the receptacle is in the position shown in Figure 4, the float valve 9 is jarred or sucked to an open position, so that air can enter through the member 7 and vent the receptacle 6.

It is to be observed that thev coupling 21 may be detached from the tube 20, and, then, the tube 2O can be advanced or retracted, in the recepte cle 6, the tube 20 being threaded into the toot plate 2. ln. this way, the amount of liquid that is lett in the receptacle 6, when the receptacle is in a vertical position, as shown in Figure l, may be varied, and, consequently, an adjustment may be made in the amount of liquid that is discharged tromthe receptacle 6 when the receptacle is shifted from the horizontal position of Figure 3 to the vertical position ot Figure 1.

The device is simple in construction, but it affords an eilicient means whereby calcium chloride solution, in a measured quantity,

may be discharged into a mass o1 concrete i aggregate, to accelerate the setting ot' the concrete. Although the device is intended tor the handling ot calcium chloride solution, it may be used, of course, for discharging any other substance into a mass ot concrete: for instance, it may be employed to deliver coloring matter into concrete which is to be tinted. f

What is claimed is l. In a device of the class described, a mixing drum, a loading skip therefor, a measuring receptacle, means providing a liquid inlet and a liquid outlet for the receptacle, mea-ns providing an opening to the atmosphere from said receptacle, means for mounting the receptacle on said skip in such position that the outlet will discharge into said drum when the skip is raised, and gravityoperated valve means responsive to the movement of the receptacle with the skipY to open the inlet when the receptacle is lowered, and to close the inlet when the skip is raised.

2. In a device of the class described, a mixing drum, a loading skip therefor, a measuring receptacle, means providing a liquid inlet and a liquid outlet for the receptacle, means for mounting the receptacle on said skip in such position that the outlet will discharge into said drum When the skip is raised, a tube extended into the receptacle, means for mounting the tube adjustably, to regulate the amount that the tube extends into the receptacle, a valve casing connected to the tube, to the liquid inlet, and to the liquid outlet, a valve in the casing and gravity means for operating the valve responsive to the movement of the receptacle with the skip to open the inlet when thereceptacle is lowered, to close the inlet when the skip is raised, to open the oulet when the skip is raised, and to close the outlet when the skip is lowered.

8. In a device of the class described, a measuring receptacle provided at one end with an air vent, a float valve controlling the air vent, a tube extended into the receptacle, means for adjusting' the tube longitudinally, to regulate the amount that the tubo extends into the receptacle, means providing a liquid outlet and a liquid inlet for thc. receptacle, gravity-operated valve mechanism connecting the tube with the inlet and with the outlet, a mixer, and means for mounting' the r'eceptacle for swinging movement with respect to the mixer, thereby to operate the aforesaid valve mechanism and to cause the outlet to discharge into the mixer.

In testimony that I claim the foregoing as my own, I have hereto atlixed my signature. v

RUSSELL C. BURKET; 

